Wood cutting machine

ABSTRACT

A chain saw comprising a saw bar having apertures staggered on alternate sides and around the periphery of the saw bar to allow the ejection of wood particles from within the chain groove.

United States Patent 11 1 Anderson [451 Aug. 20, 1974 WOOD CUTTING MACHINE [76] Inventor: Charlie Emanuel Anderson, 4346 King Mountain, Bellingham, Wash. 98225 [22] Filed: Sept. 17, 1973 [21] Appl. No.: 398,254

[52] U.S. Cl. 30/383 [51] Int. Cl B27b 17/00 [58] Field of Search 30/381-387, 30/123.4, 41.6; 83/820, 788; 299/83; 125/21 [56] References Cited UNITED STATES PATENTS 3,777,401 12/1973 Arff et al. .7 30/383 Primary Examiner-A'l Lawrence Smith Assistant ExaminerMarc R. Davidson 57 ABSTRACT A chain saw comprising a saw bar having apertures staggered on alternate sides and around the periphery of the saw bar to allow the ejection of wood particles from within the chain groove.

2 Claims, 4 Drawing Figures WOOD CUTTING MACHINE The present invention relates to an improvement of the wood cutting machine known as a chain saw and more particularly to a means of preventing a chain saw from binding as a result of wood particles.

In cutting wood with a chain saw it is desirable to keep the chain running freely with minimum friction. Friction results in loss of power and reduced cutting action. In prior art wood particles become entrapped between the chain and the groove in the saw bar, the latter acting as a guide for the chain. The continued accumulation of particles causes them to become compacted resulting in increased friction, impeding efficient operation, and sometimes completely stopping operation of the saw. Because the chain has apparently tightened, the operator loosens the adjustment of the saw bar thus slackening the chain; this action is often repeated as the saw bar continues to fill and compact with wood particles.

It is, therefore, the object of the present invention to provide a new and improved saw bar.

It is another object of the present invention to provide a saw bar which prevents binding of the chain.

A still further object of the present invention is to provide a saw bar that does not require repeated adjustment.

It is another object of the present invention to provide a saw bar that will clean itself of wood particles.

It is another object of the present invention to provide a saw bar that is economical to produce and operate.

It is another object of the present invention to provide a saw bar that will have additional cooling capability.

These and other objects, and the nature of the invention, will be apparent from the following description taken in conjunction with the accompanying drawing wherein:

FIG. 1 is a right elevation of the chain saw. The chain which provides the cutting action is shown around the periphery of the saw bar 1. Arrows indicate the direction of chain movement.

FIG. 2 is a section taken along the line 2-2 of FIG. 1 and enlarged.

FIG. 3 is a section taken along the line 3-3 of FIG. 1 and enlarged.

FIG. 4 is a section taken along the line 4-4 of FIG. 3. This figure shows the chain 2 as being comprised of cutting teeth 8 and guide 5. This is a typical representation of present art. Arrow indicates direction of chain movement.

The chain saw is comprised of the motor drive unit 7, which drives the chain 2 which by its movement around the saw bar 1 causes the saw teeth 8 to cut wood. The saw bar 1 acts to guide or direct the chain 2.

In prior art wood particles become entrapped in the chain groove 6. During operation of the saw bar shown herein apertures 3 and 4 allow the wood particles to be ejected by the movement of the chain 5.

The apertures 3 and 4 are on alternate sides of the saw bar, staggered in the manner shown around the periphery of the saw bar I.

It will be obvious to those skilled in the art that various changes may be made without departing from the spirit of the invention and therefore the invention is not limited to what is shown in the drawing and described in the specifications, but only as indicated in the appended claims.

I claim:

I. A chain saw comprising a power unit, a chain drive, a cuting chain driven by said chain drive, and a saw bar, said saw bar'comprising spaced chain guide rails around the periphery of said saw bar defining a guide slot therebetween, and means defining apertures through said rails to allow the ejection of wood particles.

2. A chain saw as in claim I, wherein said apertures are staggered on alternate sides and around the periphery of said saw bar. 

1. A chain saw comprising a power unit, a chain drive, a cuting chain driven by said chain drive, and a saw bar, said saw bar comprising spaced chain guide rails around the periphery of said saw bar defining a guide slOt therebetween, and means defining apertures through said rails to allow the ejection of wood particles.
 2. A chain saw as in claim 1, wherein said apertures are staggered on alternate sides and around the periphery of said saw bar. 